详解Spring注入集合(数组、List、Map、Set)类型属性
作者:牛哄哄的柯南
这篇文章主要介绍了详解Spring注入集合(数组、List、Map、Set)类型属性,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一起学习学习吧
注入集合(数组、List、Map、Set)类型属性
(1)创建类,定义数组,list,map,set类型属性,并且生成对应的set方法。
(2)在spring配置文件中进行配置。
Stu类:
package com.Keafmd.spring5.collectiontype; import java.util.Arrays; import java.util.List; import java.util.Map; import java.util.Set; /** * Keafmd * * @ClassName: Stu * @Description: IOC操作Bean管理(xml注入属性集合) * @author: 牛哄哄的柯南 * @date: 2021-01-15 14:15 */ public class Stu { //1、数组类型属性 private String[] courses; //2、list集合类型属性 private List<String> list; //3、map集合类型属性 private Map<String,String> maps; //4、set集合类型属性 private Set<String> sets; //学生所学的多门课程 private List<Course> courseList; public void setCourseList(List<Course> courseList) { this.courseList = courseList; } public void setCourses(String[] courses) { this.courses = courses; } public void setList(List<String> list) { this.list = list; } public void setMaps(Map<String, String> maps) { this.maps = maps; } public void setSets(Set<String> sets) { this.sets = sets; } public void test(){ System.out.println(Arrays.toString(courses)); System.out.println(list); System.out.println(maps); System.out.println(sets); System.out.println(courseList); } }
bean1.xml:
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <!--集合类型属性注入--> <bean id="stu" class="com.Keafmd.spring5.collectiontype.Stu"> <!--数组类型属性注入--> <property name="courses"> <array> <value>Java</value> <value>C++</value> <value>Python</value> </array> </property> <!--list类型属性注入--> <property name="list"> <list> <value>小明</value> <value>小红</value> </list> </property> <!--map类型属性注入--> <property name="maps"> <map> <entry key="Java" value="java"></entry> <entry key="C++" value="c++"></entry> </map> </property> <!--set类型属性注入--> <property name="sets"> <set> <value>北京</value> <value>上海</value> </set> </property> <!--注入list集合类型,值是对象--> <property name="courseList"> <list> <ref bean="course1"></ref> <ref bean="course2"></ref> </list> </property> </bean> <!--创建多个course对象--> <bean id="course1" class="com.Keafmd.spring5.collectiontype.Course"> <property name="cname" value="Spring5框架"></property> </bean> <bean id="course2" class="com.Keafmd.spring5.collectiontype.Course"> <property name="cname" value="MyBatis框架"></property> </bean> </beans>
测试类:
package com.Keafmd.spring5.testdemo; import com.Keafmd.spring5.bean.Orders; import com.Keafmd.spring5.collectiontype.Book; import com.Keafmd.spring5.collectiontype.Course; import com.Keafmd.spring5.collectiontype.Stu; import com.Keafmd.spring5.factorybean.MyBean; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; /** * Keafmd * * @ClassName: TestSpring5demo1 * @Description: 测试类 * @author: 牛哄哄的柯南 * @date: 2021-01-15 14:30 */ public class TestSpring5demo1 { @Test public void testCollection1(){ ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml"); Stu stu = context.getBean("stu",Stu.class); stu.test(); } }
输出结果:
[Java, C++, Python]
[小明, 小红]
{Java=java, C++=c++}
[北京, 上海]
[Course{cname='Spring5框架'}, Course{cname='MyBatis框架'}]Process finished with exit code 0
把集合注入部分提取出来
(1)在spring配置文件中引入名称空间util(
在配置信息中添加xmlns:util="http://www.springframework.org/schema/util"和http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd")。
(2)提取list集合类型属性注入。
(3)把提取的list集合类型属性注入使用。
Book类:
package com.Keafmd.spring5.collectiontype; import java.util.List; /** * Keafmd * * @ClassName: Book * @Description: * @author: 牛哄哄的柯南 * @date: 2021-01-15 14:56 */ public class Book { private List<String> list; public void setList(List<String> list) { this.list = list; } public void test(){ System.out.println(list); } }
bean2.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd"> <!--把集合注入部分提取出来--> <!--1、提取list集合类型属性注入--> <util:list id="bookList"> <value>老人与海</value> <value>平凡的世界</value> <value>阿甘正传</value> </util:list> <!--2、提取list集合类型属性注入使用--> <bean id="book" class="com.Keafmd.spring5.collectiontype.Book"> <property name="list" ref="bookList"></property> </bean> </beans>
测试代码:
package com.Keafmd.spring5.testdemo; import com.Keafmd.spring5.bean.Orders; import com.Keafmd.spring5.collectiontype.Book; import com.Keafmd.spring5.collectiontype.Course; import com.Keafmd.spring5.collectiontype.Stu; import com.Keafmd.spring5.factorybean.MyBean; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; /** * Keafmd * * @ClassName: TestSpring5demo1 * @Description: 测试类 * @author: 牛哄哄的柯南 * @date: 2021-01-15 14:30 */ public class TestSpring5demo1 { @Test public void testCollection2(){ ApplicationContext context = new ClassPathXmlApplicationContext("bean2.xml"); Book book = context.getBean("book",Book.class); book.test(); } }
输出结果:
[老人与海, 平凡的世界, 阿甘正传]
Process finished with exit code 0
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